Component Operation

ALTITUDE SENSING SWITCH
The altitude sensing switch consists of a bellows and a micro-switch. The bellows expands and contracts in response to changes in atmospheric pressure. At a pressure lower than the predetermined atmospheric pressure, the bellows will expand, activating the micro-switch. Electric current is now supplied to the solenoid valve and the electronic control module.

SOLENOID VALVE
The solenoid valve is actuated, at high altitudes, by current supplied from the altitude sensing switch. The valve opens to send air from the air cleaner to the three altitude compensation passages in the carburetor.